The Hilliard Auto-Lok™ is a fully mechanical, torque-activated locking differential designed to improve traction and maneuverability in off-road and utility equipment. It automatically locks both wheels under torque load and unlocks during turns—no electronics, controls, or driver input required.

Engineered for forward and reverse operation, the Auto?Lok delivers up to 60 ft?lb of torque per wheel, with full back-drive capability for consistent traction during engine braking and downhill movement. Its sealed, self-contained design allows for easy integration into new or existing drivetrains with minimal maintenance.

Ideal for compact tractors, trenchers, snow equipment, and off-road vehicles, the Auto?Lok offers durable, on-demand traction control in a compact, drop-in package.

Key Features

• Automatic mechanical locking/unlocking

• Bi-directional operation

• 60 ft-lb torque capacity per wheel

• Fully sealed, maintenance-friendly design

• Drop-in replacement for open/limited-slip differentials